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TitleDifferences in hydroacoustic backscatter signals and epifauna growth in a stony and coarse grain habitat ("Helgolaender Steingrund", German Bight, North Sea)
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorKohlmorgen, L R; Coers, S; Bischof, K; Kröncke, I; Bartholoma, A
SourceProgram and abstracts: 2017 GeoHab Conference, Dartmouth, Nova Scotia, Canada; by Todd, B JORCID logo; Brown, C J; Lacharité, M; Gazzola, V; McCormack, E; Geological Survey of Canada, Open File 8295, 2017 p. 66, Open Access logo Open Access
LinksGeoHab 2017
PublisherNatural Resources Canada
Meeting2017 GeoHab: Marine Geological and Biological Habitat Mapping; Dartmouth, NS; CA; May 1-4, 2017
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Program and abstracts: 2017 GeoHab Conference, Dartmouth, Nova Scotia, Canada
File formatpdf
AreaNorth Sea; German Bight; Germany; Denmark; Netherlands
Lat/Long WENS 6.0000 9.0000 55.0000 53.0000
Subjectsmarine geology; surficial geology/geomorphology; environmental geology; geophysics; mapping techniques; oceanography; marine environments; coastal studies; conservation; marine organisms; marine ecology; resource management; biological communities; environmental studies; ecosystems; geophysical surveys; acoustic surveys, marine; sonar surveys; side-scan sonar; faunas; photography; marine sediments; grain size distribution; Biology
ProgramOffshore Geoscience
Released2017 09 26
AbstractThere are a variety of methods used to observe stony and coarse grain habitats. Many of these, like video recordings by scuba divers, in situ recordings of macrofauna and photographic documentation, are expensive and complex. For geological analysis, grab samples are quite common, but represent just a small range of the actual habitat. Quantitative sampling of macrofauna is difficult. Thus is it important to develop new methods that are less expensive and can cover larger areas.
This study presents the first results of a combination of side-scan sonar data and drop camera records to study the presence and absence of macrofauna as well as the sediment grain size distribution in a stony and coarse grain habitat in the "Helgolaender Steingrund".
The "Helgolaender Steingrund" is a stony and natural coarse grain habitat of ~159 ha, 11 km east-northeast of Helgoland island in the German Bight (North Sea). It is included in the Flora-Fauna-Habitat guidelines and is part of the German Natura 2000 areas. Sampling was carried out during three different cruises from May to August 2016 with RV "SENCKENBERG".
Side-scan sonar and drop camera records show a quite heterogeneous habitat. Several areas comprising of different living communities were correlated to sediment grain size. Larger organisms, such as the European lobster (Homarus gammarus), the brown crab (Cancer pagurus) and the edible sea urchin (Echinus esculentus) were identified. Additionally, a cover of Bryozoan species such as Flustra foliacea and Alcyonidium diaphanum could clearly be discerned.
In conclusion, the drop camera and side-scan sonar proved to be reliable methods for the analysis of stony and coarse grain habitats such as the "Steingrund". Further analysis on the gathered data has yet to be done.
Summary(Plain Language Summary, not published)
The sixteenth annual GeoHab Conference was held this year (2017) at the Waterfront Campus of the Nova Scotia Community College in Dartmouth, Nova Scotia, Canada.

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